Temporal lobe epilepsy (TLE) is a prevalent, often drug resistant form of acquired epilepsy that frequently presents with co-morbidities such as cognitive dysfunction. Oxidative stress has been implicated in various neurological diseases including experimental models of TLE. However, whether oxidative stress contributes to chronic seizures and/or cognitive decline in TLE is unknown. Isoketals (IsoKs) and neuroketals (NeuroKs) are highly reactive gamma-ketoaldehydes (?KAs) formed via the non-enzymatic, free radical catalyzed, peroxidation of arachidonic acid and docosahexaenoic acid, respectively which are highly enriched in brain. ?KAs rapidly and irreversibly adduct to lysine residues and readily crosslink proteins which can lead to cell dysfunction. Elevated IsoKs in plasma and tissues occur in pathological conditions including Alzheimer's disease, atherosclerosis, and inflammation. Pharmacological scavenging of ?KAs has been shown to markedly inhibit cognitive impairment in humanized apoE4 mice, an animal model of Alzheimer's disease. The goals of this project are to 1) determine whether IsoK and/or NeuroK adduct formation occurs during epileptogenesis, 2) Identify candidate hippocampal proteins adducted by IsoKs/NeuroKs using mass spectrometry during epileptogenesis, 3) determine if a pharmacological scavenger of ?KAs, salicylamine (SA) can inhibit cognitive decline and/or chronic seizures associated with epileptogenesis and 4) determine if SA can inhibit neuronal death and/or reactive gliosis associated with epileptogenesis. Collectively, this project can identify a novel role of ?KAs as mediators of oxidative stress in chronic epilepsy and/or cognitive impairment associated with TLE and provides a therapeutic approach for its treatment.

Public Health Relevance

If successful, the studies proposed herein have the potential to elucidate a novel mechanism of acquired epilepsy and associated cognitive dysfunction. The proposal can provide a therapeutic avenue to prevent learning and memory deficits associated with the epilepsies. Additionally, studies will determine if the therapeutic is antiepileptogenic and/or neuroprotective.

Agency
National Institute of Health (NIH)
Type
Research Project (R01)
Project #
5R01NS086423-02
Application #
8737988
Study Section
Clinical Neuroplasticity and Neurotransmitters Study Section (CNNT)
Program Officer
Whittemore, Vicky R
Project Start
Project End
Budget Start
Budget End
Support Year
2
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Colorado Denver
Department
Pharmacology
Type
Schools of Pharmacy
DUNS #
City
Aurora
State
CO
Country
United States
Zip Code
80045
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Patel, Manisha (2016) Targeting Oxidative Stress in Central Nervous System Disorders. Trends Pharmacol Sci 37:768-78
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Liang, Li-Ping; Patel, Manisha (2016) Plasma cysteine/cystine redox couple disruption in animal models of temporal lobe epilepsy. Redox Biol 9:45-49
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Bhuyan, Pallavi; Patel, Dipan C; Wilcox, Karen S et al. (2015) Oxidative stress in murine Theiler's virus-induced temporal lobe epilepsy. Exp Neurol 271:329-34
Pearson, Jennifer N; Rowley, Shane; Liang, Li-Ping et al. (2015) Reactive oxygen species mediate cognitive deficits in experimental temporal lobe epilepsy. Neurobiol Dis 82:289-97
Ryan, Kristen; Liang, Li-Ping; Rivard, Christopher et al. (2014) Temporal and spatial increase of reactive nitrogen species in the kainate model of temporal lobe epilepsy. Neurobiol Dis 64:8-15
Gano, Lindsey B; Patel, Manisha; Rho, Jong M (2014) Ketogenic diets, mitochondria, and neurological diseases. J Lipid Res 55:2211-28

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